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Employee Benefit Plan (Tables)
6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of net periodic benefit cost and other comprehensive income
Components of Net Periodic Benefit Cost

 
Pension Benefits
Three Months Ended
 
Life and Health
Three Months Ended
 
SERP Benefits
Three Months Ended
(in thousands)
6/30/2018

 
6/30/2017

 
6/30/2018

 
6/30/2017

 
6/30/2018

 
6/30/2017

Service cost
$
0

 
$
0

 
$
53

 
$
28

 
$
35

 
$
29

Interest cost
663

 
643

 
71

 
62

 
211

 
217

Expected return on plan assets
(1,406
)
 
(1,256
)
 
0

 
0

 
0

 
0

Amortization of net retirement plan actuarial loss
292

 
286

 
16

 
13

 
135

 
98

Amortization of net retirement plan prior service (credit) cost
(3
)
 
(3
)
 
(15
)
 
(35
)
 
22

 
22

Net periodic benefit (income) cost
$
(454
)
 
$
(330
)
 
$
125

 
$
68

 
$
403

 
$
366


  
Components of Net Periodic Benefit Cost

 
Pension Benefits
Six Months Ended
 
Life and Health
Six Months Ended
 
SERP Benefits
Six Months Ended
(in thousands)
6/30/2018

 
6/30/2017

 
6/30/2018

 
6/30/2017

 
6/30/2018

 
6/30/2017

Service cost
$
0

 
$
0

 
$
106

 
$
96

 
$
80

 
$
83

Interest cost
1,254

 
1,250

 
135

 
134

 
417

 
426

Expected return on plan assets
(2,824
)
 
(2,523
)
 
0

 
0

 
0

 
0

Amortization of net retirement plan actuarial loss
559

 
537

 
31

 
17

 
270

 
199

Amortization of net retirement plan prior service cost (credit)
(5
)
 
(5
)
 
(31
)
 
(31
)
 
44

 
44

Net periodic benefit (income) cost
$
(1,016
)
 
$
(741
)
 
$
241

 
$
216

 
$
811

 
$
752